FISHES OF THE PHILIPPINE ISLANDS AND ADJACENT SEAS 11 

 HEXANCHUS GRISEUS (Bonnaterre) 



Squalus griseus Bonnateeke, Tableau Encyclop. IcMh., p. 9, 1788 (type locality: 

 Mediterranean) (on Le griset Broussonet, Mem. Acad. Sci. Paris, 1780, 

 p. 663). — CuviEE, Regne animal, vol. 2, p. 128, 1817 (reference). 



Hexanclms griseus Muixer and Henle, Syst. Beschr. Plagiostomen, p. 80, 1841 

 (Mediterranean; Atlantic Ocean).— Guichenot, Notes lie Reunion, vol. 2, 

 p. 30, 1863.— Regan, Ann. Mag. Nat. Hist., ser. 7. vol. 16, p. 571 (part), 

 1905.— Fowler, Proc. Acad. Nat. Sci. Philadelphia, 1908, p. 52 (no local- 

 ity).— Gasman, Mem. Mus. Comp. ZooL, vol. 36, p. 16, 1913 (Nice).— 

 Norman, Ann. Mag. Nat. Hist., ser. 9, vol. 9, p. 319, 1922 (Natal).— 

 Barnard, Ann. South African Mus., vol. 21, pt. 1, p. 22, 1925 (Agulhas Bank 

 and Natal coast). — Fowler, Proc. 4th (1929) Pacific Sci. Congr., Java, p. 

 484, 1930 (compiled).— Tanaka, Jap. Fish. Life Colours, No. 4, 1933.— 

 Fowler, Bull. Amer. Mus. Nat. Hist., vol. 70, pt. 1, p. 26, 1936 (compiled). 



Squalus vacca Schneider, Syst. Ichth. Bloch, p. 138, 1801 (no locality). 



MonopterJiinus colombinus Blainvillb, Bull. Soc. Philom. Paris, 1816, p. 121 

 (name only). 



Notidanus monge Risso, Hist. Nat. Europe m6rid., Poissons, vol. 3, p. 129, 1826 

 (type locality: Nice). 



Hexanchus corinus Jordan and Gilbert, Proc. U. S. Nat. Mus., vol. 3, p. 352, 

 1880 (type locality: Neah Bay, Wash.). — Garman, Mem. Mus. Comp. Zool., 

 vol. 36, p. 17, 1913 (type). 



Notidanus vulgaris Perez, Estudios sobre algunos escaulos de la costa de Chile, 

 p. 8, 1886 (type locality: Chile). — Philippi, Anal. Univ. Chile, voL 71, 

 p. 554, pi. 6, fig. 1, 1887 (Santiago).- Quijada, Boll. Mus. Nac. Chile, vol. 5, 

 pt. 1, p. 112, 1913 (San Antonio, Chile). 



Depth about 7% to siibcaudal origin, head 5, width nearly equals 

 length. Snout 2% in head; eye 6I/2, 2^4 in snout, 3% in inter- 

 orbital; mouth width about 1%, groove behind angle apparently 

 reaching halfway to first gill opening, with lower labial fold appa- 

 rently 2% ramus of lower jaw; anterior upper teeth larger, with 

 single cusp, narrowly triangular or pointed, posterior lateral teeth 

 single cusp, lower, smaller, more inclined; lower jaws with median 

 tooth, short, low cusp directed to right, other teeth each with 5 cusps 

 for anterior and 6 for posterior; preoral length 3i/^ in head; nostril 

 about half of orbit, about midway between snout end and eye, inter- 

 narial 3 in head; interorbital 1%, broad, depressed. Gill openings 

 6, first largest or about 3 in head, last before pectoral base. 



Scales minute, tricarinate and tridentate. Double row of enlarged 

 simple denticles, upper surfaces convex, all along upper edge of 

 caudal fin. 



Dorsal origin behind ends of depressed ventrals, front fin edge 

 2% in head; anal origin below middle of second dorsal base, front 

 fin edge 3% in head; caudal length 2% in rest of body; front sub- 

 caudal edge 4% in caudal fin length; least depth of caudal peduncle 

 41/^ in head; pectoral 1%, width 1% its length; ventral length 1% 

 in head. 



